2021 ICD-10-CM Code S20.422

Blister (nonthermal) of left back wall of thorax

Version 2021

Not Valid for Submission

S20.422 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of blister (nonthermal) of left back wall of thorax. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:S20.422
Short Description:Blister (nonthermal) of left back wall of thorax
Long Description:Blister (nonthermal) of left back wall of thorax

Code Classification

Coding Guidelines

The appropriate 7th character is to be added to each code from block Superficial injury of thorax (S20). Use the following options for the aplicable episode of care:

Specific Coding for Blister (nonthermal) of left back wall of thorax

Non-specific codes like S20.422 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for blister (nonthermal) of left back wall of thorax:

  • BILLABLE CODE - Use S20.422A for initial encounter
  • BILLABLE CODE - Use S20.422D for subsequent encounter
  • BILLABLE CODE - Use S20.422S for sequela

Information for Patients


Blisters

Also called: Bulla, Vesicle

What are blisters?

Blisters are fluid-filled sacs on the outer layer of your skin. They form because of rubbing, heat, or diseases of the skin. They are most common on your hands and feet.

Other names for blisters are vesicles (usually for smaller blisters) and bulla (for larger blisters).

What causes blisters?

Blisters often happen when there is friction - rubbing or pressure - on one spot. For example, if your shoes don't fit quite right and they keep rubbing part of your foot. Or if you don't wear gloves when you rake leaves and the handle keeps rubbing against your hand. Other causes of blisters include

What are the treatments for blisters?

Blisters will usually heal on their own. The skin over the blister helps keep out infections. You can put a bandage on the blister to keep it clean. Make sure that there is no more rubbing or friction on the blister.

You should contact your health care provider if

Normally you don't want to drain a blister, because of the risk of infection. But if a blister is large, painful, or looks like it will pop on its own, you can drain the fluid.

Can blisters be prevented?

There are some things you can do to prevent friction blisters:


[Learn More in MedlinePlus]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)